That was exactly the reason-the reason why the NA platforms went away for the C and CD series from the EU, which brought their own set of issues that Ford is dealing with today.
The only BOF platform that completely went away was the Ranger platform, which was going on almost 25 years without any major updates-I think the last platform update was like in 1989 and it was just sheetmetal and engine changes since then. The Crown Vic was replaced by the D3 and the Explorer (which was a close cousin to the Ranger in the early 2000s) moved to the D3 in 2010 then CD6.